And all I was saying that Arc90 was well aware of the terms of their license when they chose it. Should Apple be paid for others who make use of WebKit? After all, it is the core of Chrome OS and Google gets to use it for free.
> As an aside, Apple didn't originally write WebKit, they took it from KHTML. I'm sure Apple has released some other original code as open source.
The Darwin kernel's source used to be released (not sure it still is), I believe Clang is originally an Apple project (and so is the recently opened LLDB, a debugger for LLVM), Apple produced quite a few LLVM-related tools in general and they fund much of LLVM's work (including employing a bunch of LLVM contributors).
I believe big chunks of the Bonjour zeroconf protocol & impl are also open sourced.